Improvement in metal screens



UNITE-n STATES PATENT OFFICE.

JAMES' H0PKINS,YOF NEW YORK?, N. Yr

-lMPRovEM ENT :N METAL.l SCREENS.

Specification forming part of lIiettcrs Patent No. 36,967, dmcd November 18, 1862.

To all whom tana/y concern.-

Beit known that I, J AMES HoPKINs, ojf the city and State of New York, have invented, made, and applied to use a certain new and :useful Improvement in Metal Screens; and I do hereby declare the following to be a full,

clear, and vexact description of my said invention, reference being had to the annexed draw-V set forth, consisting of bending the wires or rods before they are woven' up,whereby heavier wire can be used in proportion to the size of mesh. v

In Letters Patent granted February 4, 1862, to J.-Laubenstein, a screenis shown'composed of square wires notched and laid together, with the diagonal ofthe square of the wires in the planeet' the screen, so that the surface of the screeni presentsthe angles of the wires. In` this instance the diagonal of the square section of wire-being longer than the side of the square causes the meshes to be smaller, with a given distance from center to ycenter' of the wires, than would be the case if the square wires were placed so that'their sides were at right angles to the plane of the screen and the flat part of the wires formed the surface of the screen. Besides this, the meshes in said patent are pyramidal or tapering from each side, thereby allowing small lumps and particles to wedge into said meshes, and wheretlies'quare wires are laid together,` with the edges of the square sections touching each other at the points of intersection, aw edgedjshaped cavity is produced between the wires at the points of intersection, where substances willr lodge and obstruct thescreen, particularly if such screen were employed for the spark-arrester of a locomotive, and in such screens the edge of the wire, being exposed to wear, is more quickly abraded than a larger extent of surface would be.

ture, especially designed for the vscreens or spark-arresters of locomotivelengines, but ap through, that prevent any substance becoming wedged into the meshes, and the surfaces of the wires at the points of intersection are, in close contact, so that no substance can loecome wedged at that point; and the surface exposed to wear is formed by the dat side ot' the wire. Thereby the durabi-lityis increased,

and the screen is made with as much weight and strength of metal as is possible with the given size of wire to the given size of mesh..

The drawings illustrate the mode of placing the square wires in the screen. Said wires are to be crimped or bent before being laid or Woven up.

My screen is a new article of manufacture, especially adapted to the spark-arresters of locomotives, as being more durable than any screen heretofore made and less liabie to become clogged by the sparks.

What I elaim,and desire to secureby Letters Patent, is-

AThe screen formed of square wires woven up or laid together, as specilied,with the sides of the said wire at right angles to the plane of the screen, for the purposes and as specified. In witness whereof I have hereunto set my signature this 25th day of July, 1862. v

JAMES HOPKINS.

.Wtnesses:

LEMUEL W. SEnRnLL, Trios. GEO. HAROLD.

4My invention is a new article of manufacl 

